【Ya-ping Siao】評論
與過去事實相反的假設:S + would (not) have +pp ... if S + had (not) + pp與現在事實相反的假設:If S +were/Ved...+ would/could +原V...
【感謝阿讚嘆阿】評論
關鍵字選文法)(常考的 if 句型) If PV. would/could/should/might + VIf had+p.p would/could/should/might have P.P